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Ocena vpliva deformabilnosti tal na obnašanje armiranobetonske stavbe pri potresni obtežbi : diplomska naloga
Andrejaš, Andrej (Author), Dolšek, Matjaž (Mentor) More about this mentor... This link opens in a new window, Pulko, Boštjan (Co-mentor), Logar, Janko (Thesis defence commission member), Košir, Mitja (Thesis defence commission member), Dovjak, Mateja (Thesis defence commission member)

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Abstract
V diplomski nalogi je obravnavan vpliv deformabilnosti tal na odziv osem etažne okvirne armiranobetonske stavbe pri potresni obtežbi. Primerjali smo odziv togo vpete in elastično vpete konstrukcije. Prisotnost zemljine v modelu upoštevamo na več načinov in sicer z upoštevanjem modula reakcije tal, kjer na stiku konstrukcije z zemljino modeliramo vzmeti in dušilke, ter z bolj točnim modelom, kjer zemljino modeliramo s 3D ali s ploskovnimi končnimi elementi. Dinamično analizo smo izvedli za tri akcelerograme katerih spektri ustrezajo elastičnemu spektru po Evrokodu 8. Uporabili smo različne modele, ki smo jih razvili s programoma SAP2000 in Plaxis. Pri analizi smo se omejili na opazovanje etažnih prečnih sil ter etažnih pomikov, ki so posledica deformiranja konstrukcije. Relativni pomiki glede na tla so pri elastično vpeti konstrukciji večji kot pri togo vpeti konstrukciji, saj se konstrukcija poleg deformacij rotira kot togo telo. Elastična vpetost vpliva ugodno na etažne prečne sile. Rezultati analize za obravnavan primer so bili podobni, če smo zemljino modelirali z vzmetmi in dušilkami, ali če smo uporabili nelinearni materialni model zemljine. Za ostale modele, kjer smo zemljino modelirali z linearno elastičnimi končnimi elementi, so bili rezultati precej različni ter verjetno napačni, saj se zemljina obnaša neelastično že pri zelo majhnih deformacijah.

Language:Slovenian
Keywords:gradbeništvo, diplomska naloga, UNI, potresno inženirstvo, geotehnika, interakcija zemljina - konstrukcija, analiza konstrukcije, armiranobetonski okvir, EC8- 5, analiza časovnega odziva, Plaxis, SAP2000
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2014
Publisher:[A. Andrejaš]
Number of pages:XVI, 128 str.
Place:Ljubljana
UDC:624.13:624.042.7(043.2)
COBISS.SI-ID:6857825 Link is opened in a new window
Views:765
Downloads:236
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Secondary language

Language:English
Title:Evaluation of the impact of soil-structure interaction on seismic response of reinforced concrete frame building
Abstract:
The thesis deals with an impact of the deformability of the soil on the seismic response of an eight storey reinforced concrete frame building during earthquake. The response of a structure with fixed base was compared to the response of a structure with consideration of soil-structure interaction. The soil-structure interaction was modelled in three different ways. In addition to the simple model with springs and dampers, which taken into account the modulus of soil reaction, the soil-structure interaction was modelled also by the linearly elastic finite elements and nonlinear finite elements. The dynamic analysis was performed using three accelerograms whose spectrum corresponded to the elastic spectrum defined according to Eurocode 8. Models were developed in program SAP2000 and Plaxis. The results were analysed in terms of storey shear forces and in storey displacements. Relative displacement in relation to the ground were greater if the soil-structure interaction was considered in the analysis. The increment of displacement is a consequence of the rotation of the structure as a rigid body due to deformation of soil. However, consideration of soil-structure interaction reduced the storey shear forces. The results when the soil was modelled by the springs and dampers were similar to those obtained in the case of nonlinear material model of the soil. For other models, where the soil was modelled by the linear elastic finite elements, the results were quite different, and probably incorrect, since the behaviour of the soil is nonlinear even at very small strains.

Keywords:earthquake engineering, geotechnical engineering, soil-structure interaction, structural analysis, reinforced concrete frame, EC8-5, time-history analysis, Plaxis, SAP2000

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